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|Number of cells||736|
|Bounding box||149 × 149|
|Discovered by||David Buckingham|
|Year of discovery||1990|
A gunstar is any of a series of four-barrelled glider guns of period 144 + 72n (n ≥ 0) that were constructed by David Buckingham in 1990 based on his transparent block reaction and Robert Wainwright's period-72 oscillator two blockers hassling R-pentomino. Two copies of the oscillator together with a blocker and two eater 1s can duplicate a glider. One output glider emerges in the same direction as the original; the other is turned 90 degrees. A 4-barrelled gun can be constructed by putting together 4 such reflectors.
Below are shown the "first" such gun, with a period of 144, and the next such gun, with a period of 216.
- Gunstar at the Life Lexicon
- Buckingham on B-heptominos in oscillators at Paul Callahan's Page of Conway's Life Miscellany